What are the three types of muscles? O structure, function, and smooth
O skeletal, cardiac, and striated
O skeletal, cardiac, and smooth
-any one help this is my science test

really dont know just need some points

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.